extends Node
## Persistent settings. Music cannot be turned down (satire).

signal settings_changed

const MUSIC_BUS := "Music"
const SFX_BUS := "SFX"
const VOICE_BUS := "Voice"

var language: String = "de"
var sfx_volume: float = 1.0
## Intentionally locked loud — slider is UI-disabled.
var music_volume: float = 1.0
var language_chosen: bool = false

func _ready() -> void:
	_ensure_buses()
	apply_audio()

func needs_language_picker() -> bool:
	return not language_chosen

func _ensure_buses() -> void:
	_ensure_bus(MUSIC_BUS)
	_ensure_bus(SFX_BUS)
	_ensure_bus(VOICE_BUS)

func _ensure_bus(bus_name: String) -> void:
	if AudioServer.get_bus_index(bus_name) != -1:
		return
	AudioServer.add_bus()
	var idx := AudioServer.bus_count - 1
	AudioServer.set_bus_name(idx, bus_name)
	AudioServer.set_bus_send(idx, "Master")

func set_language(lang: String) -> void:
	if lang not in ["de", "en", "by"]:
		return
	language = lang
	language_chosen = true
	Locale.reload()
	AudioDirector.play_language_voice(lang)
	settings_changed.emit()
	GameState.save_game()

func set_sfx_volume(value: float) -> void:
	sfx_volume = clampf(value, 0.0, 1.0)
	apply_audio()
	settings_changed.emit()
	GameState.save_game()

func set_music_volume(_value: float) -> void:
	music_volume = 1.0
	apply_audio()
	settings_changed.emit()

func apply_audio() -> void:
	_set_bus_linear(MUSIC_BUS, music_volume)
	_set_bus_linear(SFX_BUS, sfx_volume)
	_set_bus_linear(VOICE_BUS, sfx_volume)

func _set_bus_linear(bus_name: String, linear: float) -> void:
	var idx := AudioServer.get_bus_index(bus_name)
	if idx == -1:
		return
	var db := -80.0 if linear <= 0.0001 else 20.0 * log(linear) / log(10.0)
	AudioServer.set_bus_volume_db(idx, db)

func serialize() -> Dictionary:
	return {
		"language": language,
		"sfx_volume": sfx_volume,
		"music_volume": 1.0,
		"language_chosen": language_chosen,
	}

func deserialize(data: Dictionary) -> void:
	language = str(data.get("language", "de"))
	sfx_volume = float(data.get("sfx_volume", 1.0))
	music_volume = 1.0
	language_chosen = bool(data.get("language_chosen", false))
	Locale.reload()
	apply_audio()
	settings_changed.emit()